Light-reflecting sign



April 14, 1931- H. BRUCKNER 1,800,673

LIGHT REFLECTING SIGN Filed Oct. 23, 1929 /V VE/V 70/? Hu o BrucknerPatented Apr. 14, 1931 PATENT OFFICE HUGO BRUCKNER, F VIENNA, AUSTRIA.-

LIGHT-REFLECTING SIGN Application filed October 23, 1929, Serial No.401,738, and in,Austria January 24, 1929.

Applications have been filed in Austria on the 24th January, 1929, andin Austria-on the 22nd July, 1929.

The present invention relates to a light reflecting sign adaptedpreferably for the use in daylight. The light reflecting sign accordingto the invention comprises two plates, a front plate and a back plate.The front plate is provided like a stencil with 1 letters cut outthereof or with transparent letters. The back plate disposed directlybehind the front plate shows mirrored pyramidal embossments, whosereflecting surfaces are directed to the front plate or stencil.

The preferred embodiments of the invention are illustrated in theaccompanying drawing, in which Fig. 1 is a front view of one embodimentof the invention.

Fig. 2 shows a section taken on line ctr-b, Fig. 1.

Figs. 3 and 4 show front views of two further embodiments of theinvention.

Fig. 5 is a section taken on line 0d, Fig. 3. Fig. 6 is a section takenon line e-f, Fig. 4. Referring to Fig. 1 the front plate 1 of the lightreflecting sign is opaque and provided with letters 2 cut out thereoflike of a stencil. The letters may'also be formed of transparentmateriah The front side of the back plate 3 is provided with series ofmirrored elements 4. These elements are shaped according to theinvention as triangular pyramids. One side m of these pyramids isinclined steeply towards the surface of the plate 3, and much shorterthan each of the other sides n, o. This form and arrangement of thethree sides m, n, o of the mirrored pyramids has the effect to restringe0 as much as possible the shadows caused by the side m, the longreflecting sides '11., 0 amplifying simultaneously the luminescentingeffect of the sign.

In the embodiment of the invention illustrated by Figs. 3 and 5 themirrored triangular intermediate fields 2 between the pyramidal elementsof the back plate 3, are inclined backwards. so as toreflect the rays ina more flat direction to the observer. By this arrangement thereflecting sign appears field I, II, III. The small stripes betweenluminescent not only for observers to the right and to the left hand ofthe sign but also for observers standing exactly in front of the sign.

In the embodiment of the invention illustrated in Figs. 4 and 6 themirrored pyramids of one horizontal row are disposed on the upperside ofthe intermediate fields of the next row, so as to offer a kind ofzig-zag arrangement. Further in this embodiment only an inner triangularportion of each intermediate field z is inclined backwards and thisinclined portion forms a triangle p, g, r being smaller than the fullintermedlate the corresponding parallel edges of an inner triangle p, g,7" and the field I, II, III prevent a direct abutting of the embossedpyramids and the inclined intermediate fieldsJ By this arrangementtogether with the zig-zag .arrangement of the pyramid rows theappearance of continuous shadow-lines is avoided.

I claim 1. Light reflecting sign composed of a front plate withtransparent letters and a back plate arranged behind the front plate andprovided on its front side with mirrored triangular pyramids one side ofeach pyramid being inclined steeply towards the back plate and muchshorter than each of the two other sides.

2. Light reflecting sign composed of a front plate with transparentletters and a back plate arranged behind the front plate 5 and providedon its front side with mirrored triangular pyramids in zig-zagarrangement, one side of each pyramid being inclined steeply towards theback plate and much shorter than each of the two other sides andtriangular light reflecting fields on the back plate enclosed by thepyramids.

3. Light reflecting sign composed of a front plate with transparentletters and a back plate arranged behind the front plate and provided onits front side with mirrored triangular pyramids in zig-za arrangement,one side of each pyramid eing inclined steeply towards the back plateand much shorter than each of the two other sides and triangular lightreflecting fields on the back plate enclosed by the pyramids andinclined backwards. Y

4. Light reflecting sign composed of a front plate with transparentletters and a back plate arranged behind the front plate and provided onits front side with mirrored triangular pyramids in zig-zag arrangement,

one side of each pyramid being inclined steeply towards the back plateand much shorter than each of the two other sides, triangular 1 lightreflecting fields on the back plate, enclosed by the pyramids formingsmaller trian ular fields inclined backwards.

n testimony whereof I aflix my signature.

HUGO BRUCKNER.

